Process of sealing filament-carriers into bulbs of electric incandescent lamps.



J. KREMBNEZKY. mocnss 0F SEALING FILAMENT CARRIERS INTO BULBS 0F ELECTRIC INGANDESGENT LAMPS.

APPLIOATIONIILBD SEPT. 17, 1908.

Patented Nov. 30, 1909.

3 SHEETS-SHEET 1.

J. KREMENEZKY. n

PROCESS OF SEALING PILAMENT CARRIERS INTO BULBS 0F ELECTRIC INOAIIDESOENT LAMPS.

APPLIOATIOK TILED SEPT. 17, 1908.

941,996, Patented Nov. 30, 1909;

3 SHEETS-SHEET B.

J. KREMBNEZKY. PBOOESS OF SEALING FILAMENT CARRIERS INTO BULBS 0P ELECTRIC INGANDESGENT LAMPS. APPLIUATIQI FILED SEPT.1'I, 1908.

. 941,996, Patented Nov. 30, 1909 3 SHEETS-SHEET 3.

UNITED STATES PATENT OFFICE.

JOHANN KREMENEZKY, OF VIENNA, AUSTRIA-HUNGARY.

PROCESS OF SEALING FILAMENT-CARRIERS INTO BULBS OF ELECTRIC INCANDESCENT LAMPS.

To all whom it may concern:

Be it known that I, J OHANN KREMENEZKY, a subject of the Emperor of Austria-Hungary, residing at Vienna, Empire of Austria-Hungary, have invented certain new and useful Improvements in the Process of Sealing the Filament-Carriers into the Bulbs of Electric Incandescence Lamps; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to a process for sealing the filament carrier having mounted thereon the filament or filaments into the bulb of electric incandescence lamps.

The object of the invention is to cheapen and simplify this step of manufacture and to secure at the same time a tighter and more reliable oint.

In order to facilitate the understanding of this invention and to more clearly point out its distinguishing feature over the method now in use; in Figures 1 to (3 of the accompanying drawings the successive stages of the method now in use are illustrated while Figs. 7 to 9 illustrate the process in accordance with the present invention.

The bulb blanks coming from the glass works are provided with an open neck a from the blow pipe. In the method of sealing the filament carrier into the bulb as heretofore used by means of the well known sealing in machine this neck portion is first heated on a sealing in machine by means of gas flames radially converging toward such neck portion ata suitable point of its length while the bulb blank is revolved around its axis. \Vhen the glass is thus softened at the part of the neck thus heated the lower part b Fig. 2 of the neck separates from its upper part by gravity and falls down whereby the bulb blank is closed or sealed at c. \Vhile this part c is still hot and soft it is enlarged by blowing into the bulb blank through the small tube (Z, Fig. 3, attached to the blank and also serving for afterward evacuating the bulb. Thus at the lower part of the bulb blank a sphere 0 having an exceedingly thin wall is produced and this is then knocked off, whereby the lower end of the bulb blank is again opened, the opening being surrounded by an outwardly projecting rim, Fig. 4. Through this opening the fila- Specification of Letters Patent.

Application filed September 17, 1908.

Patented Nov. 30, 1909.

Serial No. 453,499.

ment or filaments mounted on the filament carrierg, Fig. 5 is or are introduced into the bulb blank and then on a second sealing in machine having gas flames radially converging toward the lower portion of the bulb blank the filament carrier is sealed into the bulb blank, the outer edge of the; disk of the filament carrier and the m 7' being united by melting as shown at "/z-, Fig. 6.

It will be seen that heretofore for scaling in the filament carrier two sealing in machines and four operations were required. Besides in a large number of bulb blanks the lower opening Z that is to say the rim had to be separately enlarged for enabling the filament or filaments together with its or their supporting frame (if there is any) to be inserted into the bulb. In the process according to the present invention only one sealing in machine with one set of gas flames is required and the sealing in of the filament carrier with carbon or metal filament or filaments mounted thereon is elfccted in a single operation.

According to the present invention the filament carrier 9 Fig. 7 together with the filament or filaments and the supporting frame for the latter (if there is any) is directly introduced into the bulb blank as it comes from the glass works and having still its neck portion athrough such neck por tion, the latter having been made somewhat larger than usual if required. The bottom disk of the filament carrier is adjusted to the proper position relatively to the bulb body on the ordinary sealing in machine and then the flames 2' of the machine which radially converge toward the bulb blank are caused to set on the neck portion of the latter near the bottom disk of the filament carrier. As the neck portion softens by the heat, it contracts under the action of the fiames and the melting glass of the neck portion unites directly with the edge of the bottom disk of the carrier which becomes likewise hot, while the lower part of the neck portion separates and falls down by gravity as shown at Z, Fig. 8 and the lower edge of the bulb is fused on the filament carrier as shown at m, Fig. 9. 0

3y this process the sealing in of the filament carrier of carbon and of metal filament lamps into the bulb is greatly simplified and cheapened because for the four operations as heretofore required nly a single one is substituted and moreover the first blow pipe apparatus starving only for preparing the bulb blank is dispensed with. Thereby the machine plant for the sealing in is simplified zltlt gas is saved to a considerable extent. A further advantage obtained by the present process is that the joint between the bulb and the filament carrier is much more intimate and reliable because the glass of the neck portion more particularly of the bottom disk of the filament carrier it' not perfectly circular is more uniformly and regularly applied than with the old process to the said bottom disk by'the strain to which the soft glass subjected owing to the weight of the separating lower neck portion. A further advantage of the present. process is the following: As the interior diameter of the neck portion a must be slightly greater than the greatest width of the filament or set of filaments or of their supporting frame in order to enable the latter to be introduced into the bulb it is necessary in the old scaling in method that the diameter of the bottom disk of the filament be nearly as great as the interior diameter of the neck portion, or as the greatest width of the filament or set of filaments. Hence in many cases and more particularly in the case of metal filament lamps it must be notably greater than the diameter of the normal lamp socket which in practice is invariably predetermined. Therefore a metal sleeve must be attached to the socket of such metal filament lamps which sleeve must be sufficiently large to inclose the lower part of the bulb which by itself materially increases the costs of manufacture of the lamps. But

moreover this sleeve which is freely accessii ble must not. be under the laws of most coun- 5 tries electrically connected with any current carrying part. and therefore this sleeve must be insulated from the socket which still more increases the costs of the manufacture.

With the present process it is possible to 'use filament "arriers having so small bottom disks that the normal sockets without sleeves may be used also with metal filament lamps which involves a great savii'ig.

Claim A process for sealing the filament carrier into the bulb of electric iucandesccm'e lamps consisting in introducing the filament carrier with the filaments mounted thereon into the bulb body of bulb blanks through the neck portion thereof, such neck portion extending below the bottom disk of the filament carrier, being cylindrical, and having an internal diameter notably greater than the external diameter of the said bottom disk of the said filament carrier; in causing the flames of a blow pipe apparatus to act on the neck portion of the bulb blank opposite the bottom disk of the said filament carrier, whereby the said neck portion is contracted and fused onto the said bottom disk and in finally causing the part of the neck portion below such bot-tom disk to separate by gravity, substantially as and for the purpose described.

In testimony whereof, l atiix my signature, in presence of two witnesses.

JOHANN KREMENEZKY.

Witnesses:

JOHN GEORGE HARDY, ROBERT W. Hnmoan'rnnn. 

